摘要
土壤重金属形态反映重金属生物有效性及潜在危害,为探讨膨润土对土壤Cu(Ⅱ)形态及其生物有效性的影响,通过模拟Cu污染土壤的盆栽试验,采用Tiesser法研究了添加膨润土后土壤Cu(Ⅱ)形态的变化特征,并进行了土壤pH值与Cu(Ⅱ)形态的相关性研究。结果表明:添加膨润土显著降低了耕种土的可交换态Cu(Ⅱ)浓度,增加了铁锰氧化物结合态和有机物结合态浓度,对碳酸盐结合态、残渣态影响不大。膨润土显著降低了绿化土的可交换态Cu(Ⅱ)浓度,增加了碳酸盐结合态、铁锰氧化物结合态和有机物结合态浓度,对残渣态影响不大。膨润土降低了Cu(Ⅱ)的生物活性系数和迁移系数,降低了土壤Cu(Ⅱ)的生物有效性。Cu(Ⅱ)形态与土壤pH值的相关性分析表明,耕种土的可交换态Cu(Ⅱ)浓度与土壤pH值呈显著负相关,铁锰氧化物结合态、有机物结合态与pH值呈正相关,碳酸盐结合态、残渣态与pH值无显著相关关系。绿化土的可交换态Cu(Ⅱ)浓度与土壤pH值呈显著负相关,碳酸盐结合态、铁锰氧化物结合态、有机物结合态与pH值呈正相关,残渣态与土壤pH值无显著相关关系。研究表明膨润土主要通过改变土壤pH值来降低土壤Cu(Ⅱ)的可交换态浓度,从而降低Cu(Ⅱ)的生物有效性。
The form of heavy metals in soil reflects the bioavailability and potential harm of heavy metals.In order to dis-cuss the influence of bentonite on the form distribution of Cu(Ⅱ)and bioavailability,a pot experiment were carried out to study the characteristics of the Cu(Ⅱ)forms through simulating Cu contaminated soil and Tiesser method,and the correlation between pH value of soil and Cu(Ⅱ)forms were studied.The results showed that:bentonite significantly reduced the concen-tration of exchangeable form of Cu(Ⅱ)in the cultivated soil,increased the concentration of Fe-Mn oxide form and organic form,and had little effect on carbonate form and residual form.Bentonite significantly reduced the concentration of exchangea-ble form of Cu(Ⅱ)in the virescence soil,increased the concentration of the carbonate form,Fe-Mn oxide form and organic form,and had little effect residual form.Bentonite decreased the biological activity coefficient and migration coefficient of Cu(Ⅱ)in soil,and decreased the bioavailability of Cu(Ⅱ)in soil.The correlation analysis of Cu(Ⅱ)forms with soil pH value showed that there is a proven negative correlation between exchangeable form of Cu(Ⅱ)with pH value in the cultivated soil,and there is a proven positively correlation between Fe-Mn oxide form,organic forms of Cu(Ⅱ)with soil pH value,and there is little correlation between carbonate form and residual form of Cu(Ⅱ)with soil pH value.There is a proven negative correla-tion between exchangeable form of Cu(Ⅱ)with pH value in the virescence soil,and there is a proven positively correlation be-tween carbonate form,Fe-Mn oxide form,organic forms of Cu(Ⅱ)with soil pH value,there is little correlation between residu-al form of Cu(Ⅱ)with soil pH value.The study shows that bentonite reduces the exchangeable concentration of Cu(Ⅱ)main-ly by changing soil pH value,thus reducing the bioavailability of Cu(Ⅱ).
作者
杨秀敏
赵福军
YANG Xiumin;ZHAO Fujun(Zhai Mingguo Academician Workstation,University of Sanya,Sanya 572022,China;School of International Design,University of Sanya,Sanya 572022,China;School of Information and Intelligence Engineering,University of Sanya,Sanya 572022,China)
出处
《金属矿山》
CAS
北大核心
2023年第9期247-253,共7页
Metal Mine
基金
三亚学院人才引进项目(编号:USYRC19-19)
海南省自然科学基金项目(编号:421MS057)
海南省基础与应用基础研究计划(自然科学领域)高层次人才项目(编号:2019RC256)。
